JP2017133564A - Vehicular motor drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize the axial length of a vehicular motor drive device, and to obtain a sufficient pump drive rotation number, even in backward moving supposed to be driven by comparatively low rotations.SOLUTION: A vehicular motor drive device is provided with a first oil pump 42 driven by rotation power of a gear shaft position on an input side, and a second oil pump 43 in which the second oil pump 43 is driven by a gear shaft positioned on an output side than the gear shaft for driving the first oil pump 42. Driving directions of the first oil pump 42 and the second oil pump 43 are set to directions opposite to each other so as to drive the second oil pump 43 by a rotating direction of the gear shaft normally rotating wheels to a forward traveling side with output from a speed reducer 2, and so as to drive the first oil pump 42 by a rotating direction of the gear shaft inversely rotating the wheels to a backward traveling side with the output from the speed reducer 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle motor drive device, and more particularly to a lubricating structure of a vehicle motor drive device for an electric vehicle.

  In a vehicle motor drive device that uses an electric motor as a drive source and decelerates the rotation of the electric motor by a speed reducer to rotate a drive wheel, the rotation of the output shaft of the speed reducer is applied to a hub wheel provided on the output shaft. In-wheel motor system that transmits and drives the drive wheel supported by the hub wheel, and the drive shaft is connected to the output shaft of the reducer through a joint, and the rotation of the drive shaft is transmitted to the hub wheel And there is an on-board system that drives the driving wheel.

  As a speed reducer for these vehicle motor drive devices, an input gear shaft that is rotated by the output torque of an electric motor, an output gear shaft that is output to a drive wheel, and an intermediate gear provided between the input gear shaft and the output gear shaft There is a gear drive reduction mechanism including a shaft, and the output torque of the electric motor is sequentially reduced to output a large output torque from the output gear shaft.

  Since the gear drive reduction mechanism of the vehicle motor drive device is driven at high rotation and high output, the gear drive reduction mechanism adopts an oil supply mechanism using an oil pump for the purpose of lubrication and cooling. It is disclosed in Patent Document 1 or Patent Document 2.

  The oil supply mechanism disclosed in Patent Document 1 sucks up oil from the oil reservoir at the bottom of the reducer housing by a pump driven by the driving force of the gear drive reduction mechanism of the reducer and discharges it to the gear drive reduction mechanism. It is to do.

  Many pump-type lubricating oil supply devices that use this type of reduction gear power often have a fixed oil pumping direction and a pump rotation direction. The electric motor and reduction gear drive the vehicle in the forward direction. There are many structures in which lubricating oil is supplied only in the case where the pump is reversed in the reverse direction, and there is a problem that the lubricating oil and air to be sucked in from the suction port of the pump flow backward and the lubricating oil cannot be supplied.

  Further, in Patent Document 1, two oil supply ports are provided for one pump, and two at each of the intake and discharge sides of the forward oil passage and the reverse oil passage (four places in total). A technique of providing a one-way valve is also disclosed.

  Furthermore, Patent Document 2 discloses a technique of providing two pumps in series. In this case, since the one-way valve is not used, the oil passage structure is simplified and the manufacturing cost can be reduced. However, the axial length by arranging two pumps and the one-way clutch in series in the axial direction can be reduced. The lengthening of the length becomes a problem.

JP 2008-87713 A JP 2009-293779 A

  However, the conventional technology with this one-way valve has the advantage that it can supply the forward and backward lubricating oil with a single pump, but it is expensive because the installation of the valve and the structure of the oil passage are complicated. Is expected.

  What can be said in common to the technologies of Patent Document 1 and Patent Document 2 is that there is no difference in pump discharge amount between forward and reverse (particularly, Patent Document 1), and the vehicle can travel at a lower speed than during forward travel. There is a possibility that satisfactory lubrication oil supply cannot be performed during the assumed reverse running.

  Accordingly, the present invention is capable of reducing the axial length of the vehicle motor drive device and obtaining a sufficient pump drive rotational speed even in reverse traveling, which is assumed to be driven at a relatively low rotation. Is an issue.

  In order to solve the above problems, the present invention includes an electric motor that generates a driving force, a reduction gear that decelerates and outputs the rotation of the electric motor with a plurality of gear shafts, a housing that houses the reduction gear, A lubricating oil tank provided in the housing and driven by the rotational power of one of the gear shafts of the plurality of stages, the lubricating oil is sucked from the lubricating oil tank, and the lubricating oil is used as a gear tooth surface of the speed reducer. In the vehicle motor drive device that includes a first oil pump and a second oil pump that are supplied to the vehicle, and drives the wheels by the output of the speed reducer, the first oil pump is a rotational power of a gear shaft positioned on the input side. The second pump is driven by a gear shaft positioned on the output side of the gear shaft that drives the first oil pump, and the output of the gear shaft rotates the gear shaft to forwardly rotate the wheel forward. The first oil pump and the second oil pump are driven so that the second oil pump is driven according to the direction, and the output from the speed reducer is driven by the rotation direction of the gear shaft that reversely rotates the wheel backward. The direction is set to be opposite to each other.

  A one-way clutch is provided between the first oil pump and the gear shaft, and a one-way clutch is provided between the second oil pump and the gear shaft, respectively. The one-way clutch provided between the second oil pump and the gear shaft may be set to idle when the direction is the forward direction, and to idle when the rotational direction of the wheel is the reverse direction.

  A housing that houses two speed reducers in parallel in the left and right is provided in the center, two electric motors are provided on the left and right sides of the housing, and the two speed reducers provided in the left and right parallel to the housing of the central speed reducer A common first oil pump and second oil pump may be provided.

  A flow path forming plate in which oil passages of the first oil pump and the second oil pump are formed is provided on the side surface of the housing that houses the reduction gear, and the first oil pump and the second oil pump are connected to the side surface of the housing and the flow path forming plate. It can be made to assemble with being sandwiched between.

  A lubricating oil tank is provided at the bottom of the housing that houses the speed reducer, and the oil level of the lubricating oil tank is positioned below the gear tooth surface of the gears provided on the multiple-stage gear shafts constituting the speed reducer. It is preferable.

  It is desirable that the lubricating oil discharge nozzles of the first oil pump and the second oil pump are provided above the meshing tooth surfaces of gears provided on a plurality of gear shafts constituting the speed reducer.

  In the vehicle motor drive device according to the present invention, the first oil pump is driven by the rotational power of the gear shaft positioned on the input side, and the gear positioned on the output side of the gear shaft driving the first oil pump. The second oil pump is driven by the rotation direction of the gear shaft that is driven by the shaft and the output from the speed reducer forwardly rotates the wheel forward. The rotation direction of the gear shaft that causes the output from the speed reducer to reversely rotate the wheel backward. By setting the drive directions of the first oil pump and the second oil pump to be opposite to each other so that the first oil pump is driven by the Pump drive speed is obtained.

  For example, a first oil pump that is a backward pump is installed on the second axis of the gear shaft of the reduction gear, a second oil pump that is a forward pump is installed on the third axis, and the second and third axes. Assuming that the reduction ratio of 3 is 3, the backward direction side rotates at a rotational speed three times that of the forward direction side, so that the pump capacity can be reduced to 1/3. In addition, since the speed of traveling in the reverse direction is assumed to be lower than the forward direction, it is assumed that the upper limit of the reverse travel speed is set to 50 km / h by setting the controller in an electrically driven vehicle having a maximum speed of 150 km / h. In such a case, it is sufficient to rotate at 1/3 of the maximum motor rotation speed, and it is possible to reduce the pump capacity to 1/3 from such an idea.

  Further, since the first oil pump and the second oil pump are provided on different shafts of the plurality of stages of gear shafts, the axial length of the vehicle motor drive device can be reduced.

  A one-way clutch is provided between the first oil pump and the gear shaft, and a one-way clutch is provided between the second oil pump and the gear shaft, respectively. When the direction is the forward direction, the one-way clutch provided between the second oil pump and the gear shaft is driven so that the pump drags when the wheel rotates in the backward direction. The drive loss due to can be reduced.

  A flow path forming plate in which oil passages of the first oil pump and the second oil pump are formed is provided on the side surface of the housing that houses the reduction gear, and the first oil pump and the second oil pump are connected to the side surface of the housing and the flow path forming plate. Therefore, it is possible to avoid the demerit that the first oil pump and the second oil pump cannot be assembled unless the outer diameter of the first oil pump and the second oil pump is smaller than the outer diameter of the bearing.

  When a lubricating oil tank is provided at the bottom of the housing that houses the speed reducer, and the oil level of the lubricating oil tank is positioned below the tooth surfaces of the gears provided on the multiple-stage gear shafts constituting the speed reducer The stirring resistance of the speed reduction part can be reduced.

1 is a longitudinal front view of a vehicle motor drive device according to an embodiment of the present invention. It is a disassembled perspective view of the reduction gear part of embodiment of FIG. It is a schematic side view which shows an example of the lubricating oil tank provided in the bottom part of the reduction gear housing in embodiment of FIG. It is a schematic side view which shows the other example of the lubricating oil tank provided in the bottom part of the reduction gear housing in embodiment of FIG. It is an enlarged view of an oil pump. It is a vertical front view of the motor drive unit for vehicles concerning other embodiments of this invention. It is a disassembled perspective view of the reduction gear part of embodiment of FIG. (A) shows the power transmission state of a one-way clutch, (b) is the schematic which shows the power interruption state of a one-way clutch. It is a vertical front view of the motor drive unit for vehicles concerning other embodiments of this invention. It is a vertical front view of the motor drive unit for vehicles concerning other embodiments of this invention. 1 is a schematic plan view of an electric vehicle equipped with a vehicle motor drive device of the present invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 11, an electric vehicle 81 equipped with a vehicle motor drive device A according to an embodiment of the present invention has a driving force applied to each of a chassis 82, a front wheel 83, a rear wheel 84, and left and right front wheels 83. Two vehicle motor drive devices A for transmitting

  FIG. 11 shows a front wheel drive vehicle in which vehicle motor drive devices A are mounted on the chassis 82 one by one on the left and right front wheels 83, and the drive force of each vehicle motor drive device A is intermediate between the constant velocity joint 86 and the middle. This is transmitted to the left and right front wheels 83 via a drive shaft comprising a shaft 88.

  As a mounting form of the vehicle motor drive device A, any of a rear wheel drive system and a four wheel drive system may be used in addition to the front wheel drive system shown in FIG.

  A vehicle motor drive device A according to the present invention shown in FIG. 1 includes an electric motor 1 and a speed reducer 2 that decelerates the rotation of the electric motor 1, and is mounted on the vehicle symmetrically with the back to back.

  The electric motor 1 and the speed reducer 2 are accommodated in a motor housing 3 and a speed reducer housing 4, respectively.

  The motor housing 3 includes a cylindrical motor housing body 3a whose outer surface is open, an outer wall 3b that closes the outer surface of the motor housing body 3a, and an inner wall that is separated from the speed reducer 2 inside the motor housing body 3a. 3c. The inner wall 3c of the motor housing body 3a is provided with an opening for drawing out the motor shaft 12a.

  As shown in FIG. 1, the electric motor 1 is a radial gap type in which a stator 11 is provided on the inner peripheral surface of the motor housing body 3 a and a rotor 12 is provided at an interval on the inner periphery of the stator 11. ing. Although not shown, an axial gap type electric motor 1 may be used.

  The rotor 12 has a motor shaft 12a at the center, and the motor shaft 12a is drawn out from the opening of the inner wall 3c of the motor housing body 3a to the speed reducer 2 side. A seal member 13 is provided between the opening of the motor housing body 3a and the motor shaft 12a.

  The motor shaft 12a is rotatably supported by rolling bearings 14a and 14b on the inner wall 3c and the outer wall 3b of the motor housing body 3a (FIG. 1).

  The reduction gear housing 4 that houses the reduction gear 2 includes a motor side housing 4a that is fixed to the motor housing body 3a and a side housing 4b that is fixed to the inner side surface of the motor side housing 4a. A flow path forming plate 4c for lubricating oil is fixed to.

  By fixing the side surface on the outboard side of the side housing 4b of the speed reducer housing 4 and the inner side wall 3c of the motor housing body 3a of the electric motor 1 by a plurality of bolts 29, the electric motor is mounted on the side of the speed reducer housing 4. 1 is fixedly arranged.

  A housing chamber 22 for housing the speed reducer 2 is provided in the motor side housing 4 a and the side housing 4 b of the speed reducer housing 4.

  As shown in FIG. 1, the speed reducer 2 includes an input shaft 23 having an input gear 23a to which power is transmitted from a motor shaft 12a, a large-diameter gear 24a that meshes with the input gear 23a, and a small-diameter gear 24b that meshes with an output gear 25a. Is a parallel shaft gear reducer provided with an intermediate shaft 24 having an output shaft and an output shaft 25 having an output gear 25a.

  Both ends of the input shaft 23 of the speed reducer 2 are rotatably supported via rolling bearings 28a and 28b by a boss portion 27a formed on the motor side housing 4a and a boss portion 27b formed on the side housing 4b.

  The end on the outboard side of the input shaft 23 is drawn outward from the opening provided in the motor side housing 4a, and a seal member 31 is provided between the opening and the outer end of the input shaft 23. The leakage of the lubricating oil sealed in the speed reducer 2 is prevented.

  The input shaft 23 has a hollow structure, and the motor shaft 12 a is inserted into the hollow input shaft 23. The input shaft 23 and the motor shaft 12a are splined.

  The intermediate shaft 24 is a stepped gear having a large-diameter gear 24a meshing with the input gear 23a and a small-diameter gear 24b meshing with the output gear 25a on the outer peripheral surface. Both ends of the intermediate shaft 24 are supported via rolling bearings 34a and 34b by a boss portion 32 formed on the motor side housing 4a and a boss portion 33 formed on the side housing 4b.

  The output shaft 25 has a large-diameter output gear 25a and is supported by rolling bearings 37a and 37b on a boss portion 35 formed on the motor side housing 4a and a boss portion 36 formed on the side housing 4b.

  The end portion on the outboard side of the output shaft 25 is pulled out of the reducer housing 4 from the opening formed in the motor side housing 4a, and is drawn on the outer peripheral surface of the end portion on the outboard side of the output shaft 25 that is pulled out. The outer ring member 15a of the constant velocity joint is splined.

  The constant velocity joint coupled to the output shaft 25 is connected to drive wheels (not shown) via a drive shaft (not shown).

  A seal member 39 is provided between an end on the outboard side of the output shaft 25 and an opening formed in the motor side housing 4a to prevent leakage of the lubricating oil sealed in the speed reducer 2.

  A first oil pump 42 and a second oil pump 43 that are driven by the rotation of the intermediate shaft 24 and the output shaft 25 are provided on the inner side surface of the side housing 4 b of the speed reducer 2.

  As shown in FIG. 3 or 4, the reduction gear housing 4 of the reduction gear 2 is provided with a lubricating oil tank 41 at the bottom.

  In the lubricating oil tank 41 of FIG. 4, the oil surface of the lubricating oil tank 41 is a plurality of gear shafts constituting the speed reducer 2, that is, the input shaft 23, the intermediate shaft 24, and the output shaft 25. Among them, the large diameter gear 24 a provided on the intermediate shaft 24 is in a position where it is immersed in the lubricating oil in the lubricating oil tank 41.

  When the gears constituting the speed reducer 2 are immersed in the lubricating oil in the lubricating oil tank 41, the influence of the stirring resistance appears.

  For this reason, in the embodiment of FIG. 3, the position of the oil surface of the lubricating oil tank 41 provided at the bottom of the speed reducer housing 4 of the speed reducer 2 is set to a plurality of gear shafts constituting the speed reducer 2, that is, the input shaft 23. The influence of the stirring resistance is reduced by preventing the gears provided on the intermediate shaft 24 and the output shaft 25 from being immersed.

  In the flow path forming plate 4c fixed to the inner surface of the side housing 4b of the speed reducer 2, oil paths 42a and 43a from the lubricating oil tank 41 to the suction ports of the first oil pump 42 and the second oil pump 43, Oil passages 42 b and 43 b are provided from the discharge ports of the first oil pump 42 and the second oil pump 43 to the discharge nozzles 42 c and 43 c provided on the upper surface of the speed reducer housing 4 of the speed reducer 2.

  As shown in FIG. 2, the first oil pump 42 and the second oil pump 43 remove the flow path forming plate 4c fixed to the inner surface of the side housing 4b of the speed reducer 2, and thereby the side housing 4b of the speed reducer 2 is removed. The first oil pump 42 and the second oil pump 43 having a diameter larger than the outer diameter of the rolling bearing 34b that supports the intermediate shaft 24 and the rolling bearing 37b that supports the output shaft 25 are reduced. 2 side housings 4b.

  As shown in FIG. 5, the first oil pump 42 and the second oil pump 43 include an inner rotor 72 that rotates using the output rotation of the speed reducer 2, and an outer rotor that is driven to rotate as the inner rotor 72 rotates. 73, a pump chamber 74, a suction port 75 communicating with the oil passages 42a and 43a of the oil pump, and a discharge port 76 communicating with the oil passages 42b and 43b formed in the flow passage forming plate 4c of the speed reducer 2. It is a cycloid pump provided.

  Inner rotor 72 has a tooth profile formed of a cycloid curve on the outer diameter surface. Specifically, the shape of the tooth tip portion 72a is an epicycloid curve, and the shape of the tooth gap portion 72b is a hypocycloid curve.

  The outer rotor 73 has a tooth profile formed of a cycloid curve on the inner diameter surface. Specifically, the shape of the tooth tip portion 73a is a hypocycloid curve, and the shape of the tooth gap portion 73b is an epicycloid curve. The outer rotor 73 is rotatably supported by a pump case 77a provided on the side housing 4b of the speed reducer 2.

  The inner rotor 72 rotates around the rotation center c1. On the other hand, the outer rotor 73 rotates around a rotation center c2 different from the rotation center c1 of the inner rotor. Further, when the number of teeth of the inner rotor 72 is n, the number of teeth of the outer rotor 73 is (n + 1). In this embodiment, n = 5.

  A plurality of pump chambers 74 are provided in the space between the inner rotor 72 and the outer rotor 73. When the inner rotor 72 rotates using the rotation of the intermediate shaft 24 or the output shaft 25 of the speed reducer 2, the outer rotor 73 rotates in a driven manner. At this time, since the inner rotor 72 and the outer rotor 73 rotate about different rotation centers c1 and c2, respectively, the volume of the pump chamber 74 changes continuously. Thereby, the lubricating oil flowing in from the suction port 75 is pumped from the discharge port 76 to the oil passages 42b and 43b, and the discharge nozzle provided on the upper surface of the speed reducer housing 4 of the speed reducer 2 as shown in FIG. Lubricating oil is discharged from 42c and 43c toward the meshing surface of the gear of the speed reducer 2.

  In the first oil pump 42 and the second oil pump 43, the second oil pump 43 is driven by the rotation of the gear shaft whose output from the speed reducer 2 rotates the wheel in the forward direction, and the output from the speed reducer 2 is the wheel. The driving directions of the first oil pump 42 and the second oil pump 43 are set to be opposite to each other so that the first oil pump 42 is driven by the rotation of the gear shaft that reversely rotates the oil pump in the reverse direction.

  In the embodiment shown in FIG. 1, the intermediate shaft 24 that drives the first oil pump 42 is located on the upper stage side of the speed reducer 2 with respect to the output shaft 25 that drives the second oil pump 43. Therefore, the intermediate shaft 24 that drives the first oil pump 42 rotates at a higher speed than the output shaft 25 that drives the second oil pump 43.

  Therefore, by installing the first oil pump 42 on the reverse side on the upper-stage shaft close to the electric motor 1, a sufficient pump driving speed can be obtained even in reverse running where it is assumed to be driven at a relatively low speed. It is done.

  For example, as in the embodiment of FIG. 1, a reverse-side first oil pump 42 is installed on the second intermediate shaft 24, and a forward-side second oil pump 43 is installed on the third-axis output shaft 25. Assuming that the reduction ratio between the second axis and the third axis is 3, the reverse side rotates at a speed three times that of the forward side, so the capacity of the pump can be reduced to 1/3. In addition, since it is assumed that the speed of traveling backward is lower than the forward direction, it is assumed that the upper limit of the backward traveling speed is 50 km / h depending on the controller setting in an electrically driven vehicle having a maximum speed of 150 km / h. In such a case, it is sufficient to rotate at 1/3 of the maximum motor rotation speed, and it is possible to reduce the pump capacity to 1/3 from such an idea.

  In the embodiment of FIG. 1, the reverse-side first oil pump 42 is formed on the second intermediate shaft 24 and the forward-side second oil pump 43 is formed on the third-axis output shaft 25. The first oil pump 42 is provided on the shaft closer to the electric motor 1 than the second oil pump 43 on the forward side, for example, the first oil pump 42 on the reverse side is provided on the input shaft 23 of the first axis, The first oil pump 42 may be provided on the intermediate shaft 24 or the output shaft 25 on the rear stage side of the input shaft 23.

  Next, in the embodiment shown in FIGS. 6 and 7, the one-way is provided between the first oil pump 42 and the drive shaft (intermediate shaft 24), and between the second oil pump 43 and the drive shaft (output shaft 25). A clutch 60 is provided, and the first oil pump 42 on the reverse side is idling in the forward drive of the vehicle, and conversely the second oil pump 43 on the normal side is idling in the reverse drive of the vehicle, thereby driving loss due to the drag driving of the pump. Is intended to reduce.

  That is, when a cycloid pump is used for the first oil pump 42 and the second oil pump 43, the suction and discharge directions are reversed during reverse rotation of the pump, so that the lubricating oil in the oil passage flows backward. A clutch 60 is provided so that the first oil pump 42 and the second oil pump 43 are not driven during the reverse rotation of the pump.

  FIG. 8A shows the power transmission state of the one-way clutch 60, and FIG. 8B shows the power cutoff state of the one-way clutch.

  The one-way clutch shown in FIGS. 8A and 8B is generally called a roller type, and mainly includes an outer ring 61, a roller 62, a spring 63, and a cage 64. The outer peripheral surface of the outer ring 61 is fitted into the inner peripheral surface of the inner rotor 72 of the oil pump, and the outer ring 61 rotates integrally with the inner rotor 72 of the oil pump. A predetermined cam surface is formed on the inner peripheral surface of the outer ring 61. An annular gap is provided between the outer peripheral surface of the drive shaft 65 (the intermediate shaft 24 or the output shaft 25 in the embodiment of FIG. 6) of the oil pump and the inner peripheral surface (cam surface) of the outer ring 61, and a roller is provided there. A plurality of sets of 62 and springs 63 are arranged. These are held by the cage 64. Each spring 63 urges each roller 62 to one side in the circumferential direction.

  When the drive shaft 65 of the oil pump attempts to rotate in the clockwise direction with respect to the outer ring 61, the roller 62 advances to the meshing position of the inner peripheral surface (cam surface) of the outer ring 61 by the spring force of the spring 63, and The rotation of the pump drive shaft 33c is transmitted to the outer ring 61 by the wedge action between the inner peripheral surface (cam surface) and the roller 62, and the inner rotor 72 of the oil pump rotates.

  Conversely, when the oil pump drive shaft 65 rotates counterclockwise with respect to the outer ring 61, the oil pump drive shaft 65 rotates relative to the outer ring 61, and the roller 62 The outer ring 61 is separated from the inner peripheral surface (cam surface) and idles with respect to the drive shaft 65 of the oil pump, the rotational force of the drive shaft 65 of the oil pump is cut off, and the inner rotor 72 of the oil pump does not rotate.

  As described above, the one-way clutch 60 is switched between ON and OFF depending on the rotation direction of the drive shaft 65 of the oil pump, and the rotation of the oil pump is only allowed to rotate in the direction of sucking the lubricating oil from the lubricating oil tank 41. To do.

  In the one-way clutch 60, the cam surface is provided on the inner peripheral surface of the outer ring 61. However, the cam surface is provided on the outer peripheral surface of the drive shaft 65 of the oil pump, and the inner peripheral surface of the outer ring 61 is a cylindrical surface. You may form in. Further, a one-way clutch other than the roller type may be used.

  Next, in the vehicle motor drive device A according to the embodiment shown in FIG. The motor housing 3 of the electric motor 1 is fixedly arranged.

  The left and right electric motors 1 are accommodated in a motor housing 3 as shown in FIG.

  The motor housing 3 includes a cylindrical motor housing body 3a whose outer surface is open, an outer wall 3b that closes the outer surface of the motor housing body 3a, and an inner wall that is separated from the speed reducer 2 inside the motor housing body 3a. 3c. The inner wall 3c of the motor housing body 3a is provided with an opening for drawing out the motor shaft 12a.

  The speed reducer housing 4 that accommodates the two speed reducers 2 provided in parallel in the left and right has a three-piece structure of a central housing 20a and left and right side housings 20b fixed to both side surfaces of the central housing 20a. The left and right side housings 20b are formed in a substantially symmetrical shape.

  By fixing the side surface on the outboard side of the side housing 20b of the speed reducer housing 4 and the inner wall 3c of the motor housing main body 3a of the electric motor 1 with a plurality of bolts 29, two units on the left and right sides of the speed reducer housing 4 are provided. The electric motor 1 is fixedly arranged.

  A partition wall 21 is provided in the center of the center housing 20a. The reduction gear housing 4 is divided into left and right parts by the partition wall 21, and independent left and right accommodation chambers 22 for accommodating the two reduction gears 2 are provided in parallel.

  A first oil pump 42 and a second oil pump 43 that are driven by the rotation of the intermediate shaft 24 and the output shaft 25 are provided on the partition wall 21 of the central housing 20a.

  The configurations of the left and right electric motors 1 and the two speed reducers 2 of the embodiment shown in FIG. 9 are basically the same as the configuration of the vehicle motor drive device A shown in FIG. A duplicate description is omitted.

  Next, in the vehicle motor drive device A according to the embodiment shown in FIG. 10, the speed reducer housing 4 that houses the two speed reducers 2 in parallel in the left-right direction is provided in the center as in the embodiment of FIG. In this structure, the motor housings 3 of the two electric motors 1 are fixedly arranged on the left and right sides of the machine housing 4.

  In the embodiment shown in FIG. 10, a first oil pump 42 and a second oil pump 43 driven by the rotation of the intermediate shaft 24 and the output shaft 25 are provided on the partition wall 21 of the central housing 20a.

  A one-way clutch 60 is provided between the first oil pump 42 and the drive shaft (intermediate shaft 24), and between the second oil pump 43 and the drive shaft (output shaft 25). When the first oil pump 42 is idling and the second oil pump 43 on the forward rotation side is idling during reverse driving of the vehicle, driving loss due to drag driving of the pump is reduced.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. The scope of the present invention is claimed. The equivalent meanings recited in the claims, and all modifications within the scope.

1: Electric motor 2: Reducer 3: Motor housing 3 a: Motor housing body 3 b: Outer wall 3 c: Inner wall 4: Reducer housing 4 a: Motor side housing 4 b: Side housing 4 c: Flow path forming plate 11: Stator 12: Rotor 12a: Motor shaft 13: Seal member 14a: Rolling bearing 14b: Rolling bearing 15a: Outer ring member 20a: Central housing 20b: Side housing 21: Partition wall 22: Storage chamber 23: Input shaft 23a: Input gear 24: Intermediate shaft 24a : Large diameter gear 24b: Small diameter gear 25: Output shaft 25a: Output gear 27a: Boss portion 27b: Boss portion 28a: Rolling bearing 28b: Rolling bearing 29: Bolt 31: Seal members 32 and 33: Boss portion 33c: Pump drive shaft 34a, 34b: Rolling bearings 35, 36: Boss portions 37a, 37 : Rolling bearing 39: Sealing member 41: Lubricating oil tank 42: First oil pumps 42a and 42b: Oil passage 42c: Discharge nozzle 43: Second oil pumps 43a and 43b: Oil passage 43c: Discharge nozzle 60: One-way clutch 61: Outer ring 62: Roller 63: Spring 64: Cage 65: Drive shaft 72: Inner rotor 72a: Tooth tip portion 72b: Tooth groove portion 73: Outer rotor 73a: Tooth tip portion 73b: Tooth groove portion 74: Pump chamber 75: Suction Port 76: Discharge port 77a: Pump case 81: Electric vehicle 82: Chassis 83: Front wheel 84: Rear wheel 86: Constant velocity joint 88: Intermediate shaft A: Motor drive device for vehicle

Claims (7)

  An electric motor for generating a driving force; a speed reducer that decelerates and outputs the rotation of the electric motor by a plurality of stages of gear shafts; a housing that houses the speed reducer; a lubricating oil tank provided in the housing; A first oil pump and a second oil pump that are driven by the rotational power of one of the gear shafts of the stage, suck the lubricating oil from the lubricating oil tank, and supply the lubricating oil to the gear tooth surfaces of the speed reducer The first oil pump is driven by the rotational power of the gear shaft located on the input side, and the second oil pump is the first oil pump. The second oil pump is driven by the rotation direction of the gear shaft that is driven by the gear shaft positioned on the output side of the gear shaft that drives the oil pump, and the output from the speed reducer forwardly rotates the wheel forward. The drive directions of the first oil pump and the second oil pump are set in opposite directions so that the first oil pump is driven by the rotation direction of the gear shaft that causes the output of the reduction gear to reversely rotate the wheel backward. A motor drive device for a vehicle that is characterized.   A one-way clutch is provided between the first oil pump and the gear shaft, and a one-way clutch is provided between the second oil pump and the gear shaft, respectively. The one-way clutch provided between the second oil pump and the gear shaft is set so as to idle when the direction of rotation is the backward direction, and the one-way clutch provided between the second oil pump and the gear shaft is set to idle. The motor drive apparatus for vehicles as described.   A housing that houses two speed reducers in parallel in the left and right is provided in the center, two electric motors are provided on the left and right sides of the housing, and the two speed reducers provided in the left and right parallel to the housing of the central speed reducer The vehicle motor drive device according to claim 1, wherein a common first oil pump and second oil pump are provided.   A flow path forming plate in which oil passages of the first oil pump and the second oil pump are formed is provided on the side surface of the housing that houses the reduction gear, and the first oil pump and the second oil pump are connected to the side surface of the housing and the flow path forming plate. The vehicle motor drive device according to claim 1 or 2, wherein the vehicle motor drive device is assembled by being sandwiched between the two.   2. A lubricating oil tank is provided at the bottom of a housing that houses the speed reducer, and the oil level of the lubricating oil tank is located below a tooth surface of a gear provided on a plurality of gear shafts constituting the speed reducer. The motor drive device for vehicles in any one of -4.   The lubricating oil discharge nozzles of the first oil pump and the second oil pump are provided above the meshing tooth surfaces of gears provided on a plurality of stages of gear shafts constituting the speed reducer. The motor drive device for vehicles in any one of -5.   7. The vehicle motor drive device according to claim 1, wherein the first oil pump and the second oil pump are cycloid pumps.

Images